Free-standing sign assembly



FIG. 1 is a front, perspective view of a free-standing sign assembly showing our new design;

FIG. 2 is a front view thereof, the rear view being identical to the front view;

FIG. 3 is a right side view thereof, the left side view being identical to the right side view; and,

FIG. 4 is a top view thereof.

The features shown in broken lines are portions of the free-standing sign assembly forming no part of the claimed design. The features shown in long dash-short dash bolded broken lines indicate the bounds of the claimed design and otherwise form no part of the claimed design. The bottom view of the free-standing sign assembly has been omitted as no bottom surfaces of the free-standing sign assembly are claimed. 

CLAIM The ornamental design for a free-standing sign assembly, as shown and described. 